Photo

FILE - In this Sept. 13, 2010, file photo, a man walks past the remains of homes damaged from a fire caused by an explosion in a mostly residential area in San Bruno, Calif. The National Transportation Safety Board's investigation has raised questions about whether the company should have known it was putting public safety at risk. Eight officials with the Pacific Gas and Electric Co. are scheduled to testify Tuesday, Mach 1, 2011, at a public hearing in Washington. (AP Photo/Jeff Chiu, File)
/ AP